<template>
  <div class="login-contain">
    <div class="login-box">
      <!-- 登录框头像区域 -->
      <div class="login_logo">
        <img src="../assets/login.jpg" alt="">
      </div>
      <!-- 表单区域 -->
      <el-form ref="loginFormRef" label-width="0px" class="login-form" :model="loginForm" :rules="loginFormRules">
        <!-- 用户名 -->
        <el-form-item prop="username">
        <el-input prefix-icon="iconfont icon-yonghu" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!-- 密码区域 -->
        <el-form-item prop="password">
        <el-input prefix-icon="iconfont icon-mimasuo" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
         <el-form-item class="btn">
         <el-button type="primary" @click="login">登录</el-button>
         <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录账号', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登录表单
    resetLoginForm () {
      // console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return false
        // 使用axios获取后台的数据，根据返回值验证表单 注意这里是promise的实例 所以需要async 和await利用结构方式获取数据
        const { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res) 利用element中的Message消息提示组件来添加功能，在element.js中按需导入所需的Message 这里的error和success是
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.$message.success(res.meta.msg)

        // 登录成功后成功后获取token并将token保存到sessionStorage中
        // 第一步在window中获取sessionStorage通过setItem获取token
        window.sessionStorage.setItem('token', res.data.token)
        // 第二步 跳转到Home.vue界面(在views文件夹中创建Home.uve)
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login-contain {
    height: 100%;
    background-image: url(../assets/bgc.jpg);
    background-size: 100% 100%;
    background-position: center center;
    .login-box {
      width: 450px;
      height: 300px;
      background-color: #fff;
      border-radius: 6px;
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%,-50%);
      .login_logo {
         height: 130px;
         width: 130px;
         border: 1px solid #eee;
         border-radius: 50%;
         padding: 10px;
         box-shadow: 0 0 10px #ddd;
         position: absolute;
         left: 50%;
         transform: translate(-50%,-50%);
         background-color: #fff;

         img {
           width: 100%;
           height: 100%;
           border-radius: 50%;
           background-color: #eee;
         }
       }
    }
    .login-form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;

      .btn {
        display: flex;
        justify-content: flex-end;
      }
    }
  }
</style>
